From left, composer and lyricist Robert Lopez, choreographer Casey Nicholow, co-creator Matt Stone and co-creator Trey Parker in the studio where the Chicago production of "The Book of Mormon" is being rehearsed in New York.

From left, composer and lyricist Robert Lopez, choreographer Casey Nicholow, co-creator Matt Stone and co-creator Trey Parker in the studio where the Chicago production of "The Book of Mormon" is being rehearsed in New York.